1 /*
2 * Copyright (c) 2020, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package org.openjdk.bench.java.lang.foreign;
24
25 import org.openjdk.jmh.annotations.Benchmark;
26 import org.openjdk.jmh.annotations.BenchmarkMode;
27 import org.openjdk.jmh.annotations.CompilerControl;
28 import org.openjdk.jmh.annotations.Fork;
29 import org.openjdk.jmh.annotations.Measurement;
30 import org.openjdk.jmh.annotations.Mode;
31 import org.openjdk.jmh.annotations.OutputTimeUnit;
32 import org.openjdk.jmh.annotations.Setup;
33 import org.openjdk.jmh.annotations.State;
34 import org.openjdk.jmh.annotations.TearDown;
35 import org.openjdk.jmh.annotations.Warmup;
36 import sun.misc.Unsafe;
37
38 import java.lang.foreign.MemorySegment;
39 import java.lang.foreign.Arena;
40 import java.nio.ByteBuffer;
41 import java.nio.ByteOrder;
42 import java.util.concurrent.TimeUnit;
43
44 import static java.lang.foreign.ValueLayout.*;
45
46 @BenchmarkMode(Mode.AverageTime)
47 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
48 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
49 @State(org.openjdk.jmh.annotations.Scope.Thread)
50 @OutputTimeUnit(TimeUnit.MILLISECONDS)
51 @Fork(3)
52 public class LoopOverConstant extends JavaLayouts {
53
54 static final Unsafe unsafe = Utils.unsafe;
55
56 static final int ELEM_SIZE = 1_000_000;
57 static final int CARRIER_SIZE = (int)JAVA_INT.byteSize();
58 static final int ALLOC_SIZE = ELEM_SIZE * CARRIER_SIZE;
59
60 static final long unsafe_addr = unsafe.allocateMemory(ALLOC_SIZE);
61
62 //setup unsafe address
63
64 static {
65 for (int i = 0; i < ELEM_SIZE; i++) {
66 unsafe.putInt(unsafe_addr + (i * CARRIER_SIZE) , i);
67 }
68 }
69
70 //setup native memory segment
71
72 static final MemorySegment segment;
73
74 static {
75 Arena scope = Arena.ofAuto();
76 segment = scope.allocate(ALLOC_SIZE, 1);
77 for (int i = 0; i < ELEM_SIZE; i++) {
78 VH_INT.set(segment, (long) i, i);
79 }
80 }
81
82 //setup direct buffer
83
84 static final ByteBuffer bb = ByteBuffer.allocateDirect(ALLOC_SIZE).order(ByteOrder.nativeOrder());
85
86 static {
87 for (int i = 0; i < ELEM_SIZE; i++) {
88 bb.putInt(i * CARRIER_SIZE , i);
89 }
90 }
91
92 @Benchmark
93 @OutputTimeUnit(TimeUnit.NANOSECONDS)
94 public int unsafe_get() {
95 return unsafe.getInt(unsafe_addr);
96 }
97
98 @Benchmark
99 @OutputTimeUnit(TimeUnit.NANOSECONDS)
100 public int segment_get() {
101 return (int)VH_INT.get(segment, 0L);
102 }
103
104 @Benchmark
105 @OutputTimeUnit(TimeUnit.NANOSECONDS)
106 public int BB_get() {
107 return bb.getInt(0);
108 }
109
110 @Benchmark
111 public int unsafe_loop() {
112 int res = 0;
113 for (int i = 0; i < ELEM_SIZE; i ++) {
114 res += unsafe.getInt(unsafe_addr + (i * CARRIER_SIZE));
115 }
116 return res;
117 }
118
119 @Benchmark
120 public int segment_loop() {
121 int res = 0;
122 for (int i = 0; i < ELEM_SIZE; i++) {
123 res += (int) VH_INT.get(segment, (long)i);
124 }
125 return res;
126 }
127
128 @Benchmark
129 public int BB_loop() {
130 int res = 0;
131 for (int i = 0; i < ELEM_SIZE; i++) {
132 res += bb.getInt(i * CARRIER_SIZE);
133 }
134 return res;
135 }
136 }